Interesting street art. They must be famous people in some way. Maybe mathematicians or scientists. I wonder if Google would know who they are. Where is the street art?
Yes, the blackboard writing seems to indicate some sort of scientist, mathematician, doctor or chemist. What kind of building was it? They could even be teachers or some sort of researcher. It's a nice mural whoever they are!
@olivetreeann I really didn't look very well, I was just walking along with a group of non photography friends, I spotted this out of the corner of my eye behind a locked gate, took a quick snap then ran to catch up with the group. I have tried using google without any success.
Ian